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Abstract

The horizontal position of a cursor on a text display system is indicated both by an underscore of the addressed, cursored character and by an underscore on a scale line at the top of the display. The cursor indication at the cursored character, is accomplished upon a compare of the character accessed in a refresh buffer with the stored address of the cursored character. The indication on the scale line is provided in response to the indication beneath the cursored character.

Country

United States

Language

English (United States)

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Shadow Cursor

The horizontal position of a cursor on a text display system is indicated both
by an underscore of the addressed, cursored character and by an underscore on
a scale line at the top of the display. The cursor indication at the cursored
character, is accomplished upon a compare of the character accessed in a
refresh buffer with the stored address of the cursored character. The indication
on the scale line is provided in response to the indication beneath the cursored
character.

In this display system a plurality of lines of text characters are displayed by
raster scanning with full length vertical display lines. Thus, with each vertical
sweep a vertical segment of a single character on each text line is illuminated on
the cathode-ray tube screen.

In Fig. 1 text character codes representative of lines to be displayed are
stored in display refresh buffer 1. The address in buffer 1 in which the cursored
character is stored is written into cursor control byte 2. When it is desired to
display an underscore immediately beneath the cursored character as well as a
shadow, underscore mark beneath the scale line at the top of the display, an
additional bit is set to 1 in byte 2.

At the beginning of the display of the frame, the cursored character address
from byte 2 is written into cursor register 4 which is connected to an input of
compare 5. As the character codes are sequentially accessed in buffer 1 by
memory address register 3, the addresses in buffer 1 of these characters are
also input to compare 5.